Kinetics of Carbon Dioxide Absorption into Mixed Aqueous Solutions of MEA + [Bmim]BF4 Using a Double Stirred Cell

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• 作者：Bihong Lu ; Xiangqian Wang ; Yinfeng Xia ; Nan Liu ; Sujing Li ; Wei Li
• 刊名：Energy & Fuels
• 出版年：2013
• 出版时间：October 17, 2013
• 年：2013
• 卷：27
• 期：10
• 页码：6002-6009
• 全文大小：399K
• 年卷期：v.27,no.10(October 17, 2013)
• ISSN：1520-5029

文摘

An aqueous blend of monoethanolamine (MEA) and 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF₄) for CO₂ absorption from simulated flue gas was investigated using a double stirred cell at a CO₂ partial pressure of 15 kPa. It was found that the values of the enhancement factor (E) and the second-order reaction rate constant (k_2,mix) for CO₂ absorption into mixed solution were higher than those into a single MEA aqueous solution with the same MEA concentration. k_2,mix and k_2,聽IL were found to be 3487.6 m³路kmol^鈥?路s^鈥? and 1936.7 m³路kmol^鈥?路s^鈥? at 303.15 K, respectively. The Arrhenius equation of CO₂ absorption was also estimated. The results proved the assumption that [Bmim]BF₄ had an active effect on the CO₂ hydration. The diffusion and solubility of the absorbent in the solution were the limiting factors of the reaction.